1// SPDX-License-Identifier: GPL-2.0
  2/**
  3 * host.c - DesignWare USB3 DRD Controller Host Glue
  4 *
  5 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
  6 *
  7 * Authors: Felipe Balbi <balbi@ti.com>,
  8 */
  9
 10#include <linux/platform_device.h>
 11
 12#include "core.h"
 13
 14static int dwc3_host_get_irq(struct dwc3 *dwc)
 15{
 16	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 17	int irq;
 18
 19	irq = platform_get_irq_byname(dwc3_pdev, "host");
 20	if (irq > 0)
 21		goto out;
 22
 23	if (irq == -EPROBE_DEFER)
 24		goto out;
 25
 26	irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
 27	if (irq > 0)
 28		goto out;
 29
 30	if (irq == -EPROBE_DEFER)
 31		goto out;
 32
 33	irq = platform_get_irq(dwc3_pdev, 0);
 34	if (irq > 0)
 35		goto out;
 36
 37	if (irq != -EPROBE_DEFER)
 38		dev_err(dwc->dev, "missing host IRQ\n");
 39
 40	if (!irq)
 41		irq = -EINVAL;
 42
 43out:
 44	return irq;
 45}
 46
 47int dwc3_host_init(struct dwc3 *dwc)
 48{
 49	struct property_entry	props[3];
 50	struct platform_device	*xhci;
 51	int			ret, irq;
 52	struct resource		*res;
 53	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
 54	int			prop_idx = 0;
 55
 56	irq = dwc3_host_get_irq(dwc);
 57	if (irq < 0)
 58		return irq;
 59
 60	res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
 61	if (!res)
 62		res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
 63				"dwc_usb3");
 64	if (!res)
 65		res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
 66	if (!res)
 67		return -ENOMEM;
 68
 69	dwc->xhci_resources[1].start = irq;
 70	dwc->xhci_resources[1].end = irq;
 71	dwc->xhci_resources[1].flags = res->flags;
 72	dwc->xhci_resources[1].name = res->name;
 73
 74	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 75	if (!xhci) {
 76		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
 77		return -ENOMEM;
 78	}
 79
 80	xhci->dev.parent	= dwc->dev;
 81
 82	dwc->xhci = xhci;
 83
 84	ret = platform_device_add_resources(xhci, dwc->xhci_resources,
 85						DWC3_XHCI_RESOURCES_NUM);
 86	if (ret) {
 87		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
 88		goto err1;
 89	}
 90
 91	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
 92
 93	if (dwc->usb3_lpm_capable)
 94		props[prop_idx++].name = "usb3-lpm-capable";
 95
 96	/**
 97	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 98	 * where Port Disable command doesn't work.
 99	 *
100	 * The suggested workaround is that we avoid Port Disable
101	 * completely.
102	 *
103	 * This following flag tells XHCI to do just that.
104	 */
105	if (dwc->revision <= DWC3_REVISION_300A)
106		props[prop_idx++].name = "quirk-broken-port-ped";
107
108	if (prop_idx) {
109		ret = platform_device_add_properties(xhci, props);
110		if (ret) {
111			dev_err(dwc->dev, "failed to add properties to xHCI\n");
112			goto err1;
113		}
114	}
115
116	phy_create_lookup(dwc->usb2_generic_phy, "usb2-phy",
117			  dev_name(dwc->dev));
118	phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
119			  dev_name(dwc->dev));
120
121	ret = platform_device_add(xhci);
122	if (ret) {
123		dev_err(dwc->dev, "failed to register xHCI device\n");
124		goto err2;
125	}
126
127	return 0;
128err2:
129	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
130			  dev_name(dwc->dev));
131	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
132			  dev_name(dwc->dev));
133err1:
134	platform_device_put(xhci);
135	return ret;
136}
137
138void dwc3_host_exit(struct dwc3 *dwc)
139{
140	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
141			  dev_name(dwc->dev));
142	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
143			  dev_name(dwc->dev));
144	platform_device_unregister(dwc->xhci);
145}